Victor birch harrison



v. B. HARRISON.

` SHARPENING DEVICE.

APPLICATION FILED NOV.29. 19.111.

l ,3 1 2,538. Patented Aug. 12, 1919.

a /zWeH/af by z5?? VICTOR BIRCH HARRISON, OF TORONTO, ONTARIO, CANADA.

SHARPENING DEVICE.

Specification of Letters Patent.

Patented Aug. 12, 1919.

Application led November 29, 1918. Serial No. 264,727.

To all whom t may concern.'

Be it lknown that I, VICTOR BIRCH HARRI- soN, a subject of the King of Great Britain, and resident of 34 Yonge street, city of Toronto, county of York, Province of Ontario, in the Dominion of Canada, have invented certain new and useful Improvements in Sharpening Devices, of which the following is a specication.

The invention relates to improvements in sharpening devices as described in the present specification and shown in the accompanying drawings that form a part of the same.

The invention consists essentially of the novel construction and arrangementof parts whereby each side of a razor blade clamp is provided with a longitudinally arranged roller adapted to engage a sharpening stone for guiding said blade in its course therealongduring the sharpening operation.

The objects of the invention are to insure the proper sharpening of a safety razor blade without altering the degree of slant of the bevel, to prolong the life of safety razor blades, and generally to provide a sharpening device which will be inexpensive to manufacture, durable and eflicient.

In the drawings Figure 1 is a perspective view of the device with a blade clamped therein.

Fig. 2 is a perspective view of the device o en.

pFig. 3 is a detail of the slotted handle to which the clamping plate is hinged.

Fig. 4 is a cross sectional view through the device.

Fig. 5 is a detail of one end of the base plate showing the slot in which the roller is secured and also showing the stem on which the handles are secured.

Like numerals of reference indicate corresponding parts in the various figures.

Referring to the drawings the clamp consists of a base plate formed up from a piece of metal having a substantially rectangular central portion 1 provided with a flat inner face and a convexed outer face 3 and having reduced ends 4 projecting therefrom and threaded at their outer ends as at 4a, and a plate 5 identical in construction to the central portion l of the base plate and fitting thereover to hold the razor blade therebetween.

The plate 5 is adjustably secured in position above the base plate by means of a lug 6 projecting from one end thereof into a slot 7 in the handle 8 and pivotally held therein by a pin 9 extending through said handle and said lug.

The plate 5 is locked to the base plate by means of a sleeve or handle 10, at its outer end threading over the threaded portion of the end 4 at its inner end being provided with a longitudinal slot 11 to accommodate a lug l2 from the end of said plate 5 and being adapted on being rotated to cover said lug to effectually prevent movement of said plate in any direction;

The plates 1 and 5 are considerably longer and narrower than a safety razor blade so as to permit of said blade being locked between the plates with the edges to be sharpened projecting beyond said plates at each side.

The plates 1 and 5 are each provided with a central longitudinal slot 13 extending throughout the greater part of the length of said plates, said slots increasing slightly in width from the fiat faces of said plate outwardly and having reduced end portions 14, each of said slots being adapted. to accommodate a roller 15 having a bearing from each end thereof adapted to enter the respective reduced end portion 14 and to be secured therein by closing the outer edges of said reduced portions thereover.

The thickness of the device from the outer edges of the rollers 15 is preferably such' lthat when the blade is inserted and the device is laid in position on the stone the whole surface of the bevel of said blade will engage the surface of said stone thus effectually preventing the alteration of the bevel and insuring a perfect cutting edge. v f

The base plate 1 is preferably provided on its inner face with circular bosses 17 spaced to correspond to the usual openings in safety razor blades and the plate 5 provided with corresponding openings so that said bosses will pass completely through the blade and extend into the openings in the upper plate and hold the blade rigidly to its position.

18 are caps screwing over the outer ends of the portions 4.

In the operation of this invention the blade to be sharpened is placed on the base plate 1 with the openings thereof fitting over the bosses 17 the plate 5 is then closed over the blade with the lug 12 fitting the slot 11 in the handle l() and said handle is rotated sufiiciently to cover said lug and prevent movement thereof. The device is' then grasped by the handles and propelled over the stone or strap with the corresponding' roller and blade edge engaging the surface of said stone or strap. The corresponding side edges of the blade may be sharpened simultaneously by allowing the engagement of one edge with the stone during one stroke and on the back stroke simply turning the device back on the opposite side of the saine roller and allowing the other edge of the blade to engage the stone.

It will thus be seen that by the employment of this device no skill Whatever is required in sharpening a blade as the proportions of the device insure the absolute preservation of the bevel.

What I claim is 1. In a sharpeningdevice, a base plate, handles projecting from the ends of said base plate, a pivoted plate adapted to be locked over said base plate and forming therewith a blade clamp, and rollers longitudinally arranged -in said plates and projecting from the outer faces thereof.

2. In a sharpening device, a base plate having reduced ends forming handle supports, handles threading over said supports, a plate hingedly secured in one of said handles and adapted to be locked oversaid base plate by the other of said handles, and rollers arranged in longitudinal slots in the outer faces of said plates.

3. In a sharpening' device, a pair of plates having convexed outer faces and flat inner faces, pivoted means for securing together said plates at one end, means for locking' together the other ends of said plates, rollers longitudinally arranged in slots in the outer faces of said plates and adapted to be rotated through engagement with a sharp ening element, and handles.

Il. In asharpening device, a substantially rectangular base plate having a flat inner face and a convexed outer face, handle sup- Copies of this patent may be obtained for ve cents each, by addressing` the Commissioner of Patents.

ports integral with said base plate and projecting' from each end thereof, handles mounted on said supports, a clamping plate having a flat inner face and a conVeXed outer face, means for pivotally securing said clamping plate to one of said handles, means for locking said clamping plate to the other of said handles over said base plate and rollers mounted in longitudinal bearings in said plates and projecting from the con vexed faces of said plates.

5. In a Sharpening device, a pair of plates having flat inner faces and conveXed outer faces, one of said plates having reduced ends forming handle supports, a handle threading' over one of said supports and slotted longitudinally at its inner lend to receive a lug from the other of said plates to adjustably connect said' plates, a handle rotatably mounted on the other of said supports and slotted to receive a lug from said other` plate for locking' said plates and rollers longitudinally mountedin slots in said plates and projecting from said conveXed faces.

6. In a sharpening device, a pair of substantially rectangular plates 'having' fiat inner faces and convexed outer face-s, said plates being' greater in length and of less Width than a safety razor blade and beingadapted to be clamped thereover With the side edges of said blade projecting therefrom, slots longitudinally arranged through said plates and tapering inwardly slightly from said conveXed faces and having reduced end portions forming bearings,l rollers operating' in said slots and having' their axles loosely mounted in said reduced portions, and handles. v

Signed 'at Toronto, Ont., this ith day of November, 1918.

VICTOR BIRCH HARRISON.

Washington, n. c. 

